(19)
(11) EP 1 403 493 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.06.2006 Bulletin 2006/26

(43) Date of publication A2:
31.03.2004 Bulletin 2004/14

(21) Application number: 03018899.9

(22) Date of filing: 20.08.2003
(51) International Patent Classification (IPC): 
F02D 41/34(2006.01)
 F02D 29/06(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
Designated Extension States:
AL LT LV MK

(30) Priority: 27.09.2002 US 256627

(71) Applicant: CATERPILLAR INC.
Peoria Illinois 61629-6490 (US)

(72) Inventors:
  • Boley, William C.
    Peoria, Illinois 61629-6490 (US)
  • Strubhar, Sean R.
    Peoria, Illinois 61629-6490 (US)

(74) Representative: Wagner, Karl H. 
Wagner & Geyer, Patentanwälte, Gewürzmühlstrasse 5
80538 München
80538 München (DE)

   


(54) Humidity compensated charge density control for an internal combustion engine


(57) Apparatus and methods for determining a desired charge density for an engine (12) having an inlet air pathway (22). A first characteristic indicative of an engine speed of the engine (12) is determined. A second characteristic indicative of a load on the engine (12) is determined. A third characteristic indicative of a humidity of air in the inlet air pathway (22). A value indicative of a desired charge density of a combustion mixture for the engine (12) is determined as a function of the first, second, and third characteristics.







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